Buggy code:
return ; } } } if ( ( this . currentElement ) instanceof RecoveredMethod ) { RecoveredMethod recoveredMethod = ( ( RecoveredMethod ) ( this . currentElement ) ) ; if ( ! ( recoveredMethod . foundOpeningBrace ) ) { if ( orphan instanceof TypeReference ) { this . currentElement = this . currentElement . parent . add ( new CompletionOnFieldType ( ( ( TypeReference ) ( orphan ) ) , true ) , 0 ) ; return ; } if ( orphan instanceof Annotation ) { CompletionOnAnnotationOfType fakeType = new CompletionOnAnnotationOfType ( CompletionParser . FAKE_TYPE_NAME , this . compilationUnit . compilationResult ( ) , ( ( Annotation ) ( orphan ) ) ) ; fakeType . isParameter = true ; this . currentElement . parent . add ( fakeType , 0 ) ; this . pendingAnnotation = fakeType ; return ; } } } if ( orphan instanceof MemberValuePair ) { buildMoreAnnotationCompletionContext ( ( ( MemberValuePair ) ( orphan ) ) ) ; return ; } if ( orphan instanceof Annotation ) { popUntilCompletedAnnotationIfNecessary ( ) ; CompletionOnAnnotationOfType fakeType = new CompletionOnAnnotationOfType ( CompletionParser . FAKE_TYPE_NAME , this . compilationUnit . compilationResult ( ) , ( ( Annotation ) ( orphan ) ) ) ; this . currentElement . add ( fakeType , 0 ) ; if ( ! ( isInsideAnnotation ( ) ) ) { this . pendingAnnotation = fakeType ; } return ; } if ( ( topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( CompletionParser . K_BETWEEN_CATCH_AND_RIGHT_PAREN ) ) { if ( ( ( this . assistNode ) instanceof CompletionOnSingleTypeReference ) && ( ( ( CompletionOnSingleTypeReference ) ( this . assistNode ) ) . isException ( ) ) ) { buildMoreTryStatementCompletionContext ( ( ( TypeReference ) ( this . assistNode ) ) ) ; return ; } else if ( ( ( this . assistNode ) instanceof CompletionOnQualifiedTypeReference ) && ( ( ( CompletionOnQualifiedTypeReference ) ( this . assistNode ) ) . isException ( ) ) ) { buildMoreTryStatementCompletionContext ( ( ( TypeReference ) ( this . assistNode ) ) ) ; return ; } else if ( ( ( this . assistNode ) instanceof CompletionOnParameterizedQualifiedTypeReference ) && ( ( ( CompletionOnParameterizedQualifiedTypeReference ) ( this . assistNode ) ) . isException ( ) ) ) { buildMoreTryStatementCompletionContext ( ( ( TypeReference ) ( this . assistNode ) ) ) ; return ; } } if ( orphan instanceof Statement ) { RecoveredMethod method = this . currentElement . enclosingMethod ( ) ; if ( method != null ) { AbstractMethodDeclaration methodDecl = method . methodDeclaration ; if ( ( ( methodDecl . bodyStart ) == ( ( methodDecl . sourceEnd ) + 1 ) ) && ( ( Util . getLineNumber ( orphan . sourceStart , this . scanner . lineEnds , 0 , this . scanner . linePtr ) ) == ( Util . getLineNumber ( methodDecl . sourceEnd , this . scanner . lineEnds , 0 , this . scanner . linePtr ) ) ) ) { return ; } } this . currentElement = this . currentElement . add ( ( ( Statement ) ( orphan ) ) , 0 ) ; return ; } } if ( isInsideAnnotation ( ) ) { Expression expression ; if ( ( this . expressionPtr ) > ( - 1 ) ) { expression = this . expressionStack [ this . expressionPtr ] ; if ( expression == ( this . assistNode ) ) { if ( ( this . topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( CompletionParser . K_MEMBER_VALUE_ARRAY_INITIALIZER ) ) { ArrayInitializer arrayInitializer = new ArrayInitializer ( ) ; arrayInitializer . expressions = new Expression [ ] { expression } ; MemberValuePair valuePair = new MemberValuePair ( CompletionParser . VALUE , expression . sourceStart , expression . sourceEnd , arrayInitializer ) ; buildMoreAnnotationCompletionContext ( valuePair ) ; } else if ( ( this . topKnownElementKind ( CompletionParser . COMPLETION_OR_ASSIST_PARSER ) ) == ( CompletionParser . K_BETWEEN_ANNOTATION_NAME_AND_RPAREN ) ) { if ( expression instanceof SingleNameReference ) { SingleNameReference nameReference = ( ( SingleNameReference ) ( expression ) ) ; CompletionOnMemberValueName memberValueName = new CompletionOnMemberValueName ( nameReference . token , nameReference . sourceStart , nameReference . sourceEnd ) ; buildMoreAnnotationCompletionContext ( memberValueName ) ; return ; } else <START_BUG> if ( expression instanceof QualifiedNameReference ) { <END_BUG> MemberValuePair valuePair = new MemberValuePair ( CompletionParser . VALUE , expression . sourceStart , expression . sourceEnd , expression ) ; buildMoreAnnotationCompletionContext ( valuePair ) ; } } else { int index ; if ( ( index = lastIndexOfElement ( AssistParser . K_ATTRIBUTE_VALUE_DELIMITER ) ) != ( - 1 ) ) { int attributeIndentifierPtr = this . elementInfoStack [ index ] ; int identLengthPtr = this . identifierLengthPtr ; int identPtr = this . identifierPtr ; while ( attributeIndentifierPtr < identPtr ) { identPtr -= this . identifierLengthStack [ ( identLengthPtr -- ) ] ; } if ( attributeIndentifierPtr != identPtr ) return ; this . identifierLengthPtr = identLengthPtr ; this . identifierPtr = identPtr ; ( this . identifierLengthPtr ) -- ; MemberValuePair memberValuePair = new MemberValuePair ( this . identifierStack [ ( ( this . identifierPtr ) -- ) ] , expression . sourceStart , expression . sourceEnd , expression ) ; buildMoreAnnotationCompletionContext ( memberValuePair ) ; return ; } } } else { CompletionNodeDetector detector = new CompletionNodeDetector ( this . assistNode , expression ) ; if ( detector . containsCompletionNode ( ) ) { MemberValuePair valuePair = new MemberValuePair ( CompletionParser . VALUE , expression . sourceStart , expression . sourceEnd , expression ) ; buildMoreAnnotationCompletionContext ( valuePair ) ; } } } if ( ( this . astPtr ) > ( - 1 ) ) { ASTNode node = this . astStack [ this . astPtr ] ; if ( node instanceof MemberValuePair ) { MemberValuePair memberValuePair = ( ( MemberValuePair ) ( node ) ) ; CompletionNodeDetector detector = new CompletionNodeDetector ( this . assistNode , memberValuePair ) ;

Fix:
if ( ( expression instanceof QualifiedNameReference ) || ( expression instanceof StringLiteral ) ) {